docs: def parse_table_name(name, project_id=None, dataset_id=None):
    """Parses a table name into its individual parts.
  
    Args:
      name: the name to parse, or a tuple, dictionary or array containing the parts.
      project_id: the expected project ID. If the name does not contain a project ID,
          this will be used; if the name does contain a project ID and it does not match
          this, an exception will be thrown.
      dataset_id: the expected dataset ID. If the name does not contain a dataset ID,
          this will be used; if the name does contain a dataset ID and it does not match
          this, an exception will be thrown.
    Returns:
      A TableName named tuple consisting of the full name and individual name parts.
    Raises:
      Exception: raised if the name doesn't match the expected formats, or a project_id and/or
          dataset_id was provided that does not match that in the name.
    """
    _project_id = _dataset_id = _table_id = _decorator = None
    if isinstance(name, basestring):
      # Try to parse as absolute name first.
      m = re.match(_ABS_TABLE_NAME_PATTERN, name, re.IGNORECASE)
      if m is not None:
        _project_id, _dataset_id, _table_id, _decorator = m.groups()
      else:
        # Next try to match as a relative name implicitly scoped within current project.
        m = re.match(_REL_TABLE_NAME_PATTERN, name)
        if m is not None:
          groups = m.groups()
          _project_id, _dataset_id, _table_id, _decorator =\
              project_id, groups[0], groups[1], groups[2]
        else:
          # Finally try to match as a table name only.
          m = re.match(_TABLE_NAME_PATTERN, name)
          if m is not None:
            groups = m.groups()
            _project_id, _dataset_id, _table_id, _decorator =\
                project_id, dataset_id, groups[0], groups[1]
    elif isinstance(name, dict):
      try:
        _table_id = name['table_id']
        _dataset_id = name['dataset_id']
        _project_id = name['project_id']
      except KeyError:
        pass
    else:
      # Try treat as an array or tuple
      if len(name) == 4:
        _project_id, _dataset_id, _table_id, _decorator = name
      elif len(name) == 3:
        _project_id, _dataset_id, _table_id = name
      elif len(name) == 2:
        _dataset_id, _table_id = name
    if not _table_id:
      raise Exception('Invalid table name: ' + str(name))
    if not _project_id:
      _project_id = project_id
    if not _dataset_id:
      _dataset_id = dataset_id
    if not _decorator:
      _decorator = ''
  
    return TableName(_project_id, _dataset_id, _table_id, _decorator)